/* 公共样式 */
body {
  font: 12px Helvetica, Arial, sans-serif;
  line-height: 1.62;
}
button {
  cursor: pointer;
}
.left {
  float: left;
}
.right {
  float: right;
}
.clearfix::after {
  content: "";
  display: block;
  clear: both;
}
